Spring chuck



J an. 9, 1923.

R. A. JOHNSON ET AL.

SPRING CHUCK.

FILED JAN. 7, 1922.

Patented Jan. 192. I

ROBERT A. JOHNSON AND CHARLES J. FANCHEB, OF WINDSOR, FEBMONT, ASSIGNORS TO THE NATIONAL ACME COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

SPRING- CHUCK.

Application filed January 7, 1922. Serial No. 527,773.

To all whom it may concern;

Be it known that we, RoBER'r A. JOHNSON and CHARLES J. FANCHER, both citizens of the United States, residing at Windsor in the county of Windsor and State of ermont, have invented certain new and useful Improvements in Spring Chucks,'of which the'following is a speclfication.

This invention relates to spring chucks, an object thereof being to provide an improved chuck adapted to be used with various types of machines, such as for instance, metal working machines, and wherein the chuck is provided with protecting means to prevent the ingress of foreign matter between the spaced members or fingers of the chuck, such means being expansible and contractible with the chuck.

A further object of this invention is to provide an improved spring chuck having protecting plates for the end faces ofthe gripping members thereof, such plates being so mounted with relation to the chuck as to expand and contract with the gripping members and also form a protecting medium for the ends of the chuck.

Other objects of this invention will appear in the following description thereof, reference being had to the accompanying drawings forming a part of this specification, wherein like reference characters indicate corresponding parts in the several views.-

and wherein Fig. 1 is a perspective view of our improved spring chuck; Fig. 2 is a front end view thereof; Fig. 3 is a central longitudinal section; Fig. 4 is a cross section taken on line 4-4 of Fig. 3; and Fig. 5 is a cross section taken on line 5-5 of Fig. 3..

It has been found in practice that one of the main disadvantages in chucks heretofore used resided int-he fact that during the operation of the machine chips or other foreign matter had a tendency to enter the spaces between the gripping members of the chuck, which often resulted in clogging the spaces between the members and interfering with the eflicient and proper operation of the chuck. It is a purpose of the present invention to do away with these disadvantages and provide an effective and an efficient means for preventing the ingress of foreign matter into the spaces between the grlpping members of the chuck.

The present improved means not only affords the necessary protection for the gripping members of the chuck, but also is expansible and contractible so as to operate in con unction with such members.

Referring to the drawing, it will be seen that the present improved springchuck comprises a tubular body member2 having the usual bore therethrough and threaded as indicated at 3 tov permit the chuck to be attached to the spindle or other part of the machine. As will be seen, the body member 2 1s prov1ded with forwardly extending fingers or pro ecting members 4, each terminating in the present instance, in enlarged ping members or fingers, the latter are prop vided with spaced protecting plates 8.

In the present instance 'these' protecting plates are mounted on the ends of the proectrng members 4, and each plate 8,-referrlng particularl to Fig. 2,is secured to one member'an freely overlaps an adacent member, the plate spanning the space between the respective members. In the present instance each plate 8 is segmental in construction and is spot-welded as at 9 to the end face 6 of a finger or member 4, and one end 10 thereof extends freely over the end face of an adjacent finger or member 4 but is not secured thereto. Thus, each protecting plate is secured to one pro ecting finger and overlaps an adjacent .fi'nger in chuck and therefore efiectually prevent the ingress of particles between the fingers.

Furthermore, these plates form a very efficient protecting medium for the ends of the chuck, and as a result of the improved and simplified construction, the effective diameter of the protecting means need be no greater than the effective diameter of the gri in end of the chuck.

claim as our invention:

1. A spring chuck comprising a body portion and a plurality of spaced projecting fingers, and expansible and contractible means for bridging the space between the end faces of a pair of fingers.

2. A spring chuck comprising a body-portion and a plurality of spaced projecting fingers, and expans'ible and contractible protecting means carried .thereby for bridging the space between the end faces of a pair of fingers.

3. A'spring chuck comprising a body portion terminating in a plurality of spaced projecting members, and radially movable means carried thereby for covering the spaces between the adjacent end faces of said members.

4. A spring chuck comprising a body portion terminating in a plurality of spaced projecting members,vand means spaced one from another and carried thereby for covering the spaces between the adjacent end faces of said members.

5. A spring chuck comprising a body portion terminating in a plurality of spaced resilient members, and a plurality of plates carried thereby for covering the spaces between the adjacent faces of said members, said plates being shiftable one relatively to another.

6. A spring chuck comprising a body portion terminatin in spaced members, and means carried t iereby for covering a space between a pair of adjacent members and permanently shiftable with one of such members.

7. A spring chuck comprising a body portion terminating in spaced members, and expansible and contractible means comprising mamas members and shiftable with saidmembers.

8. A spring chuck comprising a body portion ternnnatmg in spaced members, and expansible and contractible means supportedupon the outside of said members for covering the end spaces between the several members in all positions thereof.

9. A spring chuck comprising a body portion terminating in spaced resilient members, and means carried thereby for covermg a space between a pair of adjacent members, said means being secured to one member and overlapping an adjacent member.

10. A spring chuck comprising a body portion terminating in spaced resilient members, and means carried thereby for covering a space between a pair of adjacent members, said means being secured to one member and slidably overlapping an adjacent member.

, 11. A spring chuck comprising a body portion terminating in spaced members, and means carried thereby for covering a space between a pair of adjacent members, said meansbeing secured to the end face of one of such members and freely projecting over a part of the face of the adjacent member.

12. A spring chuck comprising a body portionterminating in spaced members, and a plurality of protecting plates, one secured to each member and extending over a part of an adjacent member, thereby to bridge the space between the same in all positions of the members.

13. A spring chuck comprising a body portion terminating in spaced members, and a plurality of protecting plates, one secured to each member and extending over a part of an adjacent member, thereby to bridge the space between the same in all positions of the members, said plates being shiftable toward and from each other conjunctively with said members.

' Signed at Windsor, Vermont, this 5th day of January, 1,922. 

